If you thought the story of Doctor Foster was over... think again. Tonight, an electrifying opening instalment proved why a series two had to happen – a tense hour of Suranne Jones and Bertie Carvel staring daggers and spitting venom, with a shindig almost as tense as that now-infamous dinner party.

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Two years after the Fosters' marriage fell apart, Simon (Carvel) has returned with a plan to take back his son and drive his spurned spouse Gemma (Jones) out of town.

But has he pushed his psychologically scarred ex-wife too far? To what lengths will Gemma go to get Tom (Tom Taylor) back? Join us as we dig into all this, and more.

1. Will Gemma kill Simon?

"There's only one way I'm leaving now and that's in a coffin."

Should we take Simon's comment at face value? Certainly, from the opening shot – of a guillotine chopping card – onwards, there's a air of barely repressed violence about this new series.

Then, in the final moments, once Simon has stolen Tom away, Gemma finally lets go of her old life with the (not entirely subtle) symbolic disintegration of her wedding ring.

BBC

What's she planning to do with that medicine bag full of needles? Will she now make it her mission to utterly destroy her ex-husband?

We've been promised that Doctor Foster will go to "some very dark places" this year, with writer Mike Bartlett hinting that series two is "about seeing the full extent of what Gemma's capable of".

2. Will Gemma shag Simon?

Alright, so it's quite the leap from killing Simon to jumping his bones… and yes, Gemma and Simon outwardly appear to hate each other's guts. She even goes all Daniel Craig at one point, insisting she'd rather "slit her own throat" than sleep with him.

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But stick with us on this: from the moment the couple are reunited, we witness a queasy sort of flirtation. "D'you think about me?" asks Simon, admitting he still dreams about Gemma.

Then later, at the wedding party, Gemma goes into great detail about Simon's… erm… little gentleman "poking into her thigh" when she brushed up against him. "I find you very attractive," he admits, adding that his feelings for her are "still there, to some extent".

BBC

So could Gemma attempt to seduce her weak-willed ex, as a means of destroying his marriage to Kate (Jodie Comer)? Surely that'd rank as the ultimate payback.

Gemma posits that Simon and Kate's own sex life has dried up after she finds a vibrator in their bedroom, so he might well find it hard not to give in to temptation.

(Of course, it's possible that Gemma could sleep with Simon, then murder him, making him the answer to all three options in this seriously warped game of Shag, Marry, Kill.)

3. Where did Simon get all his money?

BBC/Drama Republic

He was up to his eyeballs in debt two years ago, but the new, cocky Simon who returns to Parminster has a flash car, is decked out in sharp suits, and – most impressive of all – he and Kate are the proud owners of a plush new home in a well-to-do neighbourhood.

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Possibly he's landed a decent gig in London, and been able to pay off his debts? (Though you'd think the criminal record he received for assaulting Gemma might limit Simon's job options.)

He does hint at a "change of circumstance", but even so, it's a bit of a stretch for him to suddenly be flush with cash. Simon insists he was honest with Gemma about being destitute during their divorce – but then, obviously, he's lied before.

Maybe he's found a mysterious benefactor? If such a figure exists, it's probably not Kate's dad Chris Parks (Neil Stuke), who insists he hasn't given his old business partner a penny.

4. What is the gift that Gemma gave to Kate?

"Do you wish us well?"

Before he leaves for the wedding party, Gemma hands Tom a present for Kate. "Is it a bomb?" he asks, not entirely without grounds. She later finds the unopened gift discarded, underneath Tom's bed in Simon's new home. (More on that below).

Gemma eventually gives the gift to Kate herself, along with advice (or was it a warning?) not to show what's inside to Simon. Is she actually looking out for Kate, or acting purely out of spite?

The contents of that box will surely reveal how Gemma really feels about her 'replacement'.

5. What's the deal with Tom?

BBC

Gemma and Simon's teen son had seemed perturbed by the idea of his father returning to Parminster – and while Simon might insist they "get on quite well", Tom hardly seems thrilled by the prospect of attending the wedding party.

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But then, Tom starts acting strangely. Why did he discard Gemma's gift to Kate? Was he just concerned about what the box might contain, and wanted to avoid any potential embarrassment?

Later, Tom vanishes for a period of time while at Simon's party. The sequence in which Gemma hunts for her son plays out in almost horror movie-style, in such a way that we're clearly supposed to suspect something terrible's happened to Tom.

In fact, he's fine – physically, at least – but appears moody and distant and is suddenly keen to leave the party.

BBC/Drama Republic

"Inevitably, the animosity between his parents is not going to do brilliant things for Tom," Mike Bartlett has hinted. "So, that's one of the things that we explore."

Before he disappeared, Tom had been drinking and was seen hanging out with schoolmate Isobel (Hope Lloyd), but when he and Gemma leave the party, Isobel's nowhere to be seen.

Did something happen between Isobel and Tom? Has his father's misogynist behaviour had a negative influence? It'd be added motivation for why Tom betrays Gemma to go and live with his Dad, beyond just being wowed by the big house.

6. How will James play into things?

Tom's teacher James (Prasanna Puwanarajah) seems like a relatively straightforward chap - charming, handsome, self-deprecating, and with a genuine romantic interest in Gemma.

He also appears to have a high tolerance for craziness, sticking with Gemma even after she gatecrashes her ex-husband's shindig and drags him along for the ride. He even wants to call her afterwards.

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BBC/Drama Republic/Nick Briggs

Is there more to James than meets the eye? Or is he an innocent party who'll end up being dragged into Gemma and Simon's war?

7. What's the deal with Siân?

On the surface, irritating busy-body Siân (Siân Brooke) appears to be Little Miss Perfect. So she's got to be hiding something, right?

Mike Barlett has revealed that this new face in the practice has "a lot to do" later in the series: "Gemma sees Siân as a rival, and for some reason, she seems to know more about Gemma than one might expect."

8. Why is Gemma still friends with Ros?

BBC

In the first series, Thusitha Jayasundera's GP helped to cover up Simon's philandering. She was forgiven, but just one episode into series two and Gemma's best mate is lying to her again, turning up at Simon's party after insisting she'd turn down the invite.

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